Since dielectric elastomers(DEs)exhibit obvious nonlinear visco-hyperelasticity,and remarkable temperature dependence,it is difficult to accurately predict the cyclic deformation of DEs at various temperatures.To addr...Since dielectric elastomers(DEs)exhibit obvious nonlinear visco-hyperelasticity,and remarkable temperature dependence,it is difficult to accurately predict the cyclic deformation of DEs at various temperatures.To address this issue,an improved visco-hyperelastic constitutive model is proposed here to reproduce the complex temperature-dependent cyclic deformation of DEs.In the improved model,the Ogden model is chosen to provide the strain energy density representing the hyper-elastic response,a nonlinear viscosity evolution equation is used to depict the strong viscosity of DEs,and specific temperature-dependent parameters are incorporated to describe the cyclic deformation of DEs at various temperatures.Finally,the prediction capability of the proposed visco-hyperelastic model is validated by reproducing the cyclic deformation of VHB 4910 DE observed in experiments at different temperatures.This study provides a theoretical basis for the rational design of DE devices.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12102411,12072296,and 12072295)the Applied Basic Research Project of Sichuan Province(Grant No.2022NSFSC1957)+1 种基金the Research Funds from China Academy of Engineering Physics(Grant Nos.TCGH0414 and 2022YZL03)Fundamental Research Funds for Central Universities(Grant No.2682023CG004)。
基金supported by the National Natural Science Foundation of China under Grant No.11972312.
文摘Since dielectric elastomers(DEs)exhibit obvious nonlinear visco-hyperelasticity,and remarkable temperature dependence,it is difficult to accurately predict the cyclic deformation of DEs at various temperatures.To address this issue,an improved visco-hyperelastic constitutive model is proposed here to reproduce the complex temperature-dependent cyclic deformation of DEs.In the improved model,the Ogden model is chosen to provide the strain energy density representing the hyper-elastic response,a nonlinear viscosity evolution equation is used to depict the strong viscosity of DEs,and specific temperature-dependent parameters are incorporated to describe the cyclic deformation of DEs at various temperatures.Finally,the prediction capability of the proposed visco-hyperelastic model is validated by reproducing the cyclic deformation of VHB 4910 DE observed in experiments at different temperatures.This study provides a theoretical basis for the rational design of DE devices.
